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path distance maps with R?

2 messages · David March Morlà, Roger Bivand

Original
David March Morlà
# 
Dear all,

I want to create port-based distance maps to analyse spatial 
distribution of fishing effort. I have tried to use ?distmap.ppp? 
function from spatstat, but this computes Euclidean distances and I want 
to take into account obstacles (i.e. islands) in the same way as Caddy 
and Carocci (http://www.faocopemed.org/vldocs/0000028/publi04.pdf). Have 
you got any suggestion to perform these path distance maps with R?

Thanks,
1 day later
Roger Bivand
#
On Tue, 26 Jun 2007, David March Morl? wrote:

            

      
      
      
    

        
If you have access to a GIS, you might find it more appropriate. The 
r.cost module in GRASS can do this very effectively, having first 
converted the vector land mask to raster, spreading from vector points 
over a raster sea within the sea mask. Naturally, this is best for 
projected cordinates.

Roger